The Shivan starts without a door system, requiring 60 scrap to install. It is the only ship which does not have airlocks, preventing any sections from being vented to space except via a hull breach. If in advanced edition, Lanius crew can be used to suck air out of rooms, even if they are not in that room, also the Fire Suppression augment works wonders as it helps put out fires.

Unlock
Earning two of the three Rock Cruiser achievements will unlock Layout B.

Trivia
The name "Shivan" combined with the color scheme of Layout B is a reference to an alien race of the same name in the game Descent: Freespace.